Cailyn is a distinctive girls' name in United States, ranking #870 in 2006 with 306 recorded births. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 225.5%. In 2006, approximately 1 in every 6,213 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.